According to a support FAQ from Apple, rented TV Shows are limited to being played on devices running iOS 4.1 or later. Specifically, the FAQ indicates that rented TV shows downloaded via iTunes 10 can be played only on the computer, iPhone 3G, iPhone 3GS or iPod touch and HD TV rentals can only be played on the computer, iPhone 4 or iPod touch (4th generation) and that iOS 4.1 or later is required.
This restriction not only prevents rented TV Shows from being played on Click Wheel iPods and the first-generation Apple TV but also rules out iPad compatibility at least until such time as iOS 4.2 ships in November. It is also uncertain at this time if TV Shows rented in iTunes 10 can be streamed to the second-generation Apple TV or whether users will need to rent TV shows directly on the device.
Further, as with the movie rental restrictions discovered earlier this month, the FAQ also indicates that TV Shows rented on the iPhone 4 or fourth-generation iPod touch are “not transferable to any other device or computer” meaning that they must be watched only on the device used to rent them..